Average annual temperature is 16.9 °C
Absolute maximum temperature: 34.7 °C
Absolute minimum temperature: -3.6 °C
Number of sunny days: 180 days
Number of rainy days: 184 days
Number of snow days: 1 day
Look at detailed online map of Kosai
* Weather data for Kosai Japan is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 15.3 | 16.5 | 21.2 | 23.9 | 26.3 | 29.0 | 34.7 | 34.1 | 30.9 | 27.8 | 25.4 | 19.6 |
| Average daytime temperature (°C) | 9.2 | 10.8 | 15.8 | 18.4 | 21.6 | 24.8 | 30.0 | 30.3 | 28.9 | 22.2 | 17.6 | 12.6 |
| Average temperature (°C) | 5.8 | 7.0 | 12.1 | 15.2 | 18.7 | 22.2 | 27.0 | 27.6 | 26.0 | 18.0 | 13.8 | 8.9 |
| Average night temperature (°C) | 2.7 | 3.6 | 8.3 | 11.8 | 15.9 | 20.0 | 24.1 | 25.1 | 23.2 | 14.3 | 10.4 | 5.8 |
| Absolute minimum temperature (°C) | -3.6 | -0.8 | 2.6 | 5.3 | 10.8 | 15.7 | 21.2 | 22.6 | 18.3 | 10.3 | 4.6 | 0.5 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.4 | 14.2 | 13.4 | 12.4 | 11.3 | 10.4 | 9.9 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 7.8 | 7.6 | 8.3 | 8.5 | 9.1 | 7.4 | 11.3 | 10.5 | 9.7 | 8.8 | 7.7 | 7.5 |
| Precipitation (mm) | 51 | 81 | 158 | 167 | 237 | 501 | 59 | 201 | 188 | 163 | 126 | 80 |
| Sunny days | 20 | 19 | 17 | 16 | 13 | 12 | 13 | 2 | 7 | 19 | 20 | 22 |
| Rainy days | 10 | 9 | 14 | 14 | 18 | 18 | 18 | 29 | 23 | 12 | 10 | 9 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Kosai during the most sunny months:
The largest precipitation sum in Kosai is at